* {
    padding: 0px;
    margin: 0px;
}
body {
    margin: 5px;
    border: 1px solid silver;
    border-radius: 5px;
    box-shadow: 5px 5px 5px #888888;
}
#header {
    height: 50px;
    background-color: #666666;
    padding-top: 10px;
    padding-left: 10px;
    color: whitesmoke;
    font-weight: 900;
}
#content {
    display: flex;
    height: 900px;
}
#center, #left, #right {
    overflow: auto;
    height: 100%;
}
#center {
    border-left: 2px solid white;
    border-right: 2px solid white;
}
#left .header, #right .header, #center .header{
    background: rgb(54, 54, 54);
    color: white;
    padding: 4px;
}
#center {
    width: 60%;
    background-color: #3333ff
}
#left {
    width: 20%;
    background-color: #ff33cc;
}
#right {
    width: 20%;
    background-color: #ff33cc;
}
.design-area, .exports-area {
    height: 50%;
    background-color: white;
}
